Rubber compositions containing a carboxymaleimidophenyl ester
CA 2274936 A1 · Owner: Sandstrom, Paul Harry · Inventors: Sandstrom, Paul Harry; Wideman, Lawson Gibson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to rubber compositions containing an elastomer having olefinic unsaturation and a carboxymaleimidophenyl ester of the formula, wherein R1 is selected from the group alkyls having from 1 to 8 carbon atoms and aryls having from 6 to 10 carbon atoms; and R2 and R3 may be the same or different and are selected from the group consisting of hydrogen, halogen and alkyls having from 1 to 8 carbon atoms.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.